IsoCodes\Gtin::check()

Complexity

Conditions	5
Paths	5

Size

Total Lines	23
Code Lines	16

Duplication

Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

<?php
    public static function check($gtin, $length)
    {
        $gtin = self::unDecorate($gtin);
        if (strlen($gtin) != $length) {
            return false;
        }
        $expr = sprintf('/\\d{%d}/i', $length);
        if (!preg_match($expr, $gtin)) {
            return false;
        }
        $check = 0;
        for ($i = 0; $i < $length; $i += 2) {
            if ($length % 2 == 0) {
                $check += 3 * substr($gtin, $i, 1);
                $check += (int) substr($gtin, $i + 1, 1);
            } else {
                $check += (int) substr($gtin, $i, 1);
                $check += 3 * substr($gtin, $i + 1, 1);
            }
        }

        return $check % 10 == 0;
    }